reptiles, with mammals its gram positive. They harder to detect as they do not show in a regular fecal float.
Some can show in a gram stain done with a fecal sample, or swabbing the mouth or cloacal area (just inside the vent)and then staining it and checking it under a mircoscope.
When a fecal is clear and husbandry needs seem right, thats the next area to check for a problem. With rescue dragons it is often a problem from prior care and if we are getting nothing back on any test, yet know we have a sick animal on our hands, we have tried a round of light broad spectrum antibiotics, if there is a infection, you usually see improvement within two days and minor miracles within a week. Let untreated the animal can become very ill and die.
Most common heard of gram negative bacteria in reptiles is Salmonella, others are Proteus, Providencia, Pseudomonas, Klebsiella (those were found in some crickets tested from a supplier) Shigella and Escherichia amoung others. They are harder to detect and to treat that gram positive bacteria as they have a outer membrane that some meds can not break through. But a good vet can also look at other symptoms and determine the likelyhood that a gram neg bacteria may be present.
Some meds used to treat gram negative bacteria are Cipro and Baytril.
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